Studies in community genetics have often revealed a relationship between genetic diversity of the focal species and species diversity of the associated biotic communities. This relationship was studied in forest communities dominated by black alder (Alnus glutinosa Gaertn.), one of the few tree species tolerating an anoxic environment of waterlogged soils. It is a dominant species of tree overstory in two types of communities: alder carrs, forest swamps with stagnating water, and riparian forests occurring along smaller waterflows, periodically flooded with a considerable water level fluctuation during the vegetation period. Plant community composition and genetic variation of alder populations were studied in 218 black alder communities of both types distributed along a broad latitudinal transect from the Pannonian lowland to the Western Carpathians (Hungary, Slovakia, Poland). Species diversity was significantly higher in riparian stands than in alder carrs, while no difference was observed in the genetic diversity. The analysis of population structure revealed differentiation between Pannonian and Carpathian populations, which may be attributed to different migration pathways during the Holocene. No correlation was observed between genetic diversity of alder and species diversity of the associated vascular plant communities. On the other hand, using the ddRAD-sequencing approach applied to 96 trees, we identified 19 single-nucleotide polymorphisms significantly associated with climatic and soil variables. However, the hypothesized bioindication function of the plant community composition on the genetic variation of black alder as a focal species was not confirmed.

群落遗传学研究经常揭示焦点物种的遗传多样性与相关生物群落的物种多样性之间的关系。在以黑桤木（ Alnus glutinosa）为主的森林群落中研究了这种关系Gaertn.），少数能够耐受浸水土壤缺氧环境的树种之一。它是两种类型群落中树木覆盖的优势物种：桤木、积水的森林沼泽和沿着较小水流生长的河岸森林，在植被期间周期性地被相当大的水位波动淹没。对沿从潘诺尼亚低地到西喀尔巴阡山脉（匈牙利、斯洛伐克、波兰）的宽阔纬度样带分布的 218 个两种类型的黑桤木群落进行了植物群落组成和桤木种群遗传变异的研究。河岸林分的物种多样性显着高于桤木林分，但遗传多样性没有观察到差异。种群结构分析揭示了潘诺尼亚种群和喀尔巴阡种群之间的差异，这可能归因于全新世期间不同的迁徙途径。在桤木的遗传多样性和相关维管植物群落的物种多样性之间没有观察到相关性。另一方面，通过对 96 棵树应用 ddRAD 测序方法，我们鉴定了 19 个与气候和土壤变量显着相关的单核苷酸多态性。然而，植物群落组成对黑桤木作为焦点物种遗传变异的假设生物指示功能尚未得到证实。在桤木的遗传多样性和相关维管植物群落的物种多样性之间没有观察到相关性。另一方面，通过对 96 棵树应用 ddRAD 测序方法，我们鉴定了 19 个与气候和土壤变量显着相关的单核苷酸多态性。然而，植物群落组成对黑桤木作为焦点物种遗传变异的假设生物指示功能尚未得到证实。在桤木的遗传多样性和相关维管植物群落的物种多样性之间没有观察到相关性。另一方面，通过对 96 棵树应用 ddRAD 测序方法，我们鉴定了 19 个与气候和土壤变量显着相关的单核苷酸多态性。然而，植物群落组成对黑桤木作为焦点物种遗传变异的假设生物指示功能尚未得到证实。